Transformer system for measuring electrical current
US4810989A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Aug 19, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F38/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A transformer system for measuring electrical current includes an electrical conductor having first and second conductor portions. The first conductor portion conducts electrical current in one direction and the second conductor portion conducts the electrical current in an opposite direction. The first conductor portion produces a magnetic field H.sub.a and the second conductor portion produces a magnetic field H.sub.b. A coil having a non-ferromagnetic core is positioned between the first and second conductor portions so that the axis of the coil is substantially parallel to the magnetic fields H.sub.a and H.sub.b. The separation between the outer circumferential surface of the coil and the first and second conductor portions is the minimum distance for avoiding a voltage breakdown therebetween for a predetermined maximum electrical current in the conductor portions. At least one ferromagnetic shield surrounds the first and second conductor portions for shielding the coil from external magnetic fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.